Environmental stress screening tester

Abstract

The invention discloses an environmental stress screening tester. Temperature can be increased and decreased at a speed of 25 DEG C per minute, and temperature increasing and decreasing speed is adjustable, so that the problem that existing environmental stress screening testers are generally low in temperature increasing and decreasing speed. After the tester runs, dry air can be continuously delivered into a testing area, so that positive pressure and environment dryness of the testing area are maintained; when a cold accumulation area starts cold accumulation, a circulating airway of the testing area starts air circulation, so that in this way, quick temperature increase can be realized; after reaching set temperature, the testing area can enter a constant-temperature state; after constant temperature time is up, each compressor is controlled to work for quick cooling; when cooling speed cannot reach set cooling speed, cold of the cold accumulation area can enter the circulating airway of the testing area by only opening a valve of the cold accumulation area, so that cooling speed can be accelerated; when the cooling speed reaches the set cooling speed or when temperature reaches a set value, the valve of the cold accumulation area is off automatically.

Description

technical field [0001] The invention belongs to the field of high and low temperature rapid temperature rise and fall, in particular to an environmental stress screening test machine. Background technique [0002] Environmental Stress Screening (ESS) applies temperature cycle stress on electronic products to find and eliminate defective parts, components, process defects in products and prevent early failure. Objects that fail early, such as defective products in structure, material, manufacturing process, transportation and storage, can be eliminated through ESS detection before the product is assembled, avoiding the impact on the schedule during production and avoiding the increase in failure during the execution of tasks the costing payment. [0003] At present, the heating and cooling speed of the existing environmental stress screening testing machines is generally slow (the temperature that can rise or fall per minute is below 15°C), and it needs to use liquid nitroge...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of environmental stress screening testing machine, which solves the problem that current environmental stress screening testing machines generally have slow heating and cooling speeds and need to use liquid nitrogen to assist cooling, so that it can Due to certain limitations in the process, it has the problems of small heat load, small controllable range of cooling speed and high cost of use.

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